Comets as Porous Aggregates of Interstellar Dust

Details Comets as Porous Aggregates of Interstellar Dust Comets as Porous Aggregates of Interstellar Dust

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nyasa.822...96g&link_type=abstract

Near-Earth Objects, the United Nations International Conference: Proceedings of the international conference held April 24-26, 1

Mathematics

Logic

2

Aggregates, Carbonaceous Chondrites, Comet Nuclei, Comets, Cosmic Dust, Interstellar Matter, Morphology, Porosity, Thermal Conductivity, Astronomical Models, Chemical Composition, Collapse, Molecular Clouds, Nebulae, Porous Materials, Tensile Strength

Scientific paper

A comet model is derived based on the interstellar dust chemical composition in dense molecular and diffuse clouds resulting from their subsequent chemical interactions and UV photoprocessing. The collapsing presolar nebula leads to a porous aggregate model for comet nuclei from which is derived certain physical properties that include thermal conductivity and tensile strength. The porous morphological structure is also shown to imply anomalous (expansion rather than contraction) behavior when subjected to strong shock waves which is supported by recent shock experiments on (porous) carbonaceous chondrite material.

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